2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * (C) Copyright 2002 (440 port)
6 * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
8 * (C) Copyright 2003 Motorola Inc. (MPC85xx port)
9 * Xianghua Xiao (X.Xiao@motorola.com)
11 * (C) Copyright 2004 Freescale Semiconductor. (MPC86xx Port)
12 * Jeff Brown (Jeffrey@freescale.com)
13 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
15 * See file CREDITS for list of people who contributed to this
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
37 #include <asm/processor.h>
38 #include <ppc_asm.tmpl>
40 unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */
43 unsigned long timestamp;
45 static __inline__ unsigned long get_msr (void)
49 asm volatile ("mfmsr %0":"=r" (msr):);
54 static __inline__ void set_msr (unsigned long msr)
56 asm volatile ("mtmsr %0"::"r" (msr));
59 static __inline__ unsigned long get_dec (void)
63 asm volatile ("mfdec %0":"=r" (val):);
69 static __inline__ void set_dec (unsigned long val)
72 asm volatile ("mtdec %0"::"r" (val));
75 /* interrupt is not supported yet */
76 int interrupt_init_cpu (unsigned *decrementer_count)
82 int interrupt_init (void)
86 /* call cpu specific function from $(CPU)/interrupts.c */
87 ret = interrupt_init_cpu (&decrementer_count);
92 decrementer_count = get_tbclk()/CFG_HZ;
93 debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n", (get_tbclk()/1000000), decrementer_count);
95 set_dec (decrementer_count);
97 set_msr (get_msr () | MSR_EE);
99 debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n", get_msr(), get_dec());
105 void enable_interrupts (void)
107 set_msr (get_msr () | MSR_EE);
110 /* returns flag if MSR_EE was set before */
111 int disable_interrupts (void)
113 ulong msr = get_msr ();
115 set_msr (msr & ~MSR_EE);
116 return (msr & MSR_EE) != 0;
120 void increment_timestamp(void)
126 * timer_interrupt - gets called when the decrementer overflows,
127 * with interrupts disabled.
128 * Trivial implementation - no need to be really accurate.
131 timer_interrupt_cpu (struct pt_regs *regs)
133 /* nothing to do here */
137 void timer_interrupt (struct pt_regs *regs)
139 /* call cpu specific function from $(CPU)/interrupts.c */
140 timer_interrupt_cpu (regs);
146 /* Restore Decrementer Count */
147 set_dec (decrementer_count);
149 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
150 if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
152 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
154 #ifdef CONFIG_STATUS_LED
155 status_led_tick (timestamp);
156 #endif /* CONFIG_STATUS_LED */
158 #ifdef CONFIG_SHOW_ACTIVITY
159 board_show_activity (timestamp);
160 #endif /* CONFIG_SHOW_ACTIVITY */
165 void reset_timer (void)
170 ulong get_timer (ulong base)
172 return timestamp - base;
175 void set_timer (ulong t)
181 * Install and free a interrupt handler. Not implemented yet.
185 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
190 irq_free_handler(int vec)
196 /*******************************************************************************
198 * irqinfo - print information about PCI devices,not implemented.
202 do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
204 printf ("\nInterrupt-unsupported:\n");
210 * Handle external interrupts
213 external_interrupt(struct pt_regs *regs)
215 puts("external_interrupt (oops!)\n");